Handle rpc requests unwrap crash in stratumserver.rs

[sesam]

Merge after https://github.com/mimblewimble/grin/pull/2468/files

Fixes #2421
Together with hashmaps the_message.clear fix, this solves the catastrophic #2421 that made stratum servers to become unreachable in a hard to detect manner.

We need additional issues about testing that should be added.

[rlinxy]

Thanks for fixing the bug, but got another 'panic' today while using the executable built from the new code.
But this one is much more stable than previous.

20190122 22:27:40.912 WARN grin_servers::mining::stratumserver - (Server ID: 0) Failed to parse JSONRpc: JSON error - [123, 34, 105, 100, 34, 58, 34, 51, 34, 44, 34, 106, 115, 111, 110, 114, 112, 99, 34, 58, 34, 50, 46, 48, 34, 44, 34, 109, 101, 116, 104, 111, 100, 34, 58, 34, 115, 117, 98, 109, 105, 116, 34, 44, 34, 112, 97, 114, 97, 109, 115, 34, 58, 123, 34, 101, 100, 103, 101, 95, 98, 105, 116, 115, 34, 58, 50, 57, 44, 34, 104, 101, 105, 103, 104, 116, 34, 58, 57, 54, 56, 52, 44, 34, 106, 111, 98, 95, 105, 100, 34, 58, 50, 44, 34, 110, 111, 110, 99, 101, 34, 58, 49, 52, 55, 57, 56, 57, 55, 56, 57, 48, 54, 49, 56, 55, 52, 55, 49, 48, 54, 55, 44, 34, 112, 111, 119, 34, 58, 91, 50, 48, 57, 55, 52, 54, 48, 56, 44, 51, 49, 55, 54, 56, 51, 57, 50, 44, 52, 49, 49, 54, 49, 49, 54, 53, 44, 53, 50, 51, 48, 56, 53, 55, 48, 44, 53, 50, 52, 54, 48, 53, 50, 51, 44, 57, 57, 56, 53, 51, 49, 52, 49, 44, 49, 52, 53, 48, 54, 49, 53, 52, 57, 44, 49, 52, 53, 55, 57, 51, 57, 57, 57, 44, 49, 53, 55, 51, 48, 57, 50, 50, 56, 44, 49, 53, 56, 48, 56, 52, 54, 50, 57, 44, 49, 55, 55, 51, 53, 56, 48, 54, 53, 44, 50, 48, 48, 56, 55, 54, 57, 55, 50, 44, 50, 49, 57, 50, 57, 50, 55, 54, 57, 44, 50, 50, 48, 57, 52, 55, 57, 49, 55, 44, 50, 50, 51, 56, 48, 48, 57, 49, 50, 44, 50, 51, 48, 55, 51, 52, 57, 56, 54, 44, 50, 51, 48, 56, 57, 56, 51, 52, 51, 44, 50, 51, 51, 48, 51, 49, 52, 54, 54, 44, 50, 51, 52, 48, 57, 48, 51, 57, 50, 44, 50, 53, 51, 53, 52, 50, 55, 49, 54, 44, 50, 54, 52, 48, 56, 48, 56, 53, 53, 44, 50, 56, 48, 50, 57, 50, 52, 56, 52, 44, 50, 56, 53, 52, 51, 50, 53, 49, 54, 44, 50, 57, 53, 53, 48, 53, 50, 57, 49, 44, 51, 48, 50, 56, 57, 48, 48, 52, 48, 44, 51, 50, 49, 51, 53, 53, 51, 57, 53, 44, 51, 50, 56, 57, 50, 53, 52, 50, 54, 44, 51, 52, 48, 54, 51, 57, 55, 50, 50, 44, 51, 53, 54, 55, 51, 53, 52, 52, 51, 44, 51, 53, 57, 48, 49, 49, 52, 48, 55, 44, 51, 54, 49, 51, 48, 53, 57, 54, 50, 44, 51, 55, 55, 53, 51, 56, 56, 48, 49, 44, 51, 57, 54, 54, 54, 54, 55, 53, 57, 44, 52, 48, 49, 54, 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115, 34, 58, 123, 34, 101, 100, 103, 101, 95, 98, 105, 116, 115, 34, 58, 50, 57, 44, 34, 104, 101, 105, 103, 104, 116, 34, 58, 57, 54, 56, 52, 44, 34, 106, 111, 98, 95, 105, 100, 34, 58, 50, 44, 34, 110, 111, 110, 99, 101, 34, 58, 56, 49, 57, 57, 56, 54, 57, 57, 51, 50, 49, 49, 51, 48, 57, 50, 50, 51, 55, 44, 34, 112, 111, 119, 34, 58, 91, 53, 50, 56, 53, 49, 51, 57, 44, 50, 56, 53, 50, 48, 50, 53, 48, 44, 50, 57, 53, 49, 50, 56, 56, 48, 44, 51, 53, 50, 53, 48, 48, 55, 56, 44, 55, 49, 49, 53, 50, 50, 53, 51, 44, 57, 49, 50, 51, 53, 56, 57, 57, 44, 57, 55, 52, 48, 48, 57, 49, 56, 44, 49, 48, 56, 56, 53, 50, 52, 53, 49, 44, 49, 50, 52, 55, 55, 54, 51, 55, 54, 44, 49, 50, 53, 53, 48, 51, 55, 53, 48, 44, 49, 51, 53, 55, 50, 56, 50, 48, 53, 44, 49, 51, 54, 55, 54, 56, 56, 53, 57, 44, 49, 54, 54, 55, 49, 49, 54, 57, 56, 44, 49, 54, 57, 54, 50, 55, 53, 56, 55, 44, 49, 56, 55, 55, 52, 54, 53, 49, 55, 44, 49, 56, 57, 57, 48, 54, 50, 53, 48, 44, 49, 57, 51, 50, 52, 48, 54, 56, 48, 44, 49, 57, 56, 53, 53, 51, 48, 53, 56, 44, 50, 48, 50, 57, 55, 55, 56, 53, 53, 44, 50, 48, 53, 49, 50, 55, 56, 55, 52, 44, 50, 52, 48, 55, 56, 48, 52, 57, 54, 44, 50, 52, 54, 52, 53, 48, 49, 55, 56, 44, 50, 52, 56, 52, 53, 55, 52, 48, 52, 44, 50, 55, 56, 57, 53, 49, 54, 57, 51, 44, 50, 56, 51, 48, 55, 54, 52, 51, 49, 44, 50, 57, 51, 53, 50, 49, 56, 48, 54, 44, 50, 57, 53, 53, 51, 57, 54, 49, 48, 44, 50, 57, 57, 51, 49, 56, 52, 52, 51, 44, 51, 49, 48, 50, 50, 53, 50, 53, 54, 44, 51, 51, 54, 53, 48, 55, 51, 55, 53, 44, 51, 52, 52, 57, 51, 49, 49, 51, 56, 44, 51, 52, 54, 57, 54, 50, 51, 52, 48, 44, 51, 54, 52, 54, 53, 55, 51, 54, 49, 44, 51, 56, 54, 51, 56, 56, 54, 55, 54, 44, 52, 51, 52, 57, 57, 51, 52, 57, 48, 44, 52, 52, 53, 54, 49, 53, 53, 49, 52, 44, 52, 54, 56, 51, 52, 48, 51, 52, 48, 44, 52, 55, 48, 52, 48, 49, 48, 54, 55, 44, 52, 55, 50, 49, 53, 56, 51, 52, 55, 44, 52, 57, 52, 49, 57, 53, 57, 55, 53, 44, 53, 48, 56, 53, 50, 51, 49, 53, 48, 44, 53, 49, 53, 48, 50, 49, 57, 56, 49, 93, 125, 125, 10, 123, 34, 105, 100, 34, 58, 34, 51, 34, 44, 34, 106, 115, 111, 110, 114, 112, 99, 34, 58, 34, 50, 46, 48, 34, 44, 34, 109, 101, 116, 104, 111, 100, 34, 58, 34, 115, 117, 98, 109, 105, 116, 34, 44, 34, 112, 97, 114, 97, 109, 115, 34, 58, 123, 34, 101, 100, 103, 101, 95, 98, 105, 116, 115, 34, 58, 50, 57, 44, 34, 104, 101, 105, 103, 104, 116, 34, 58, 57, 54, 56, 52, 44, 34, 106, 111, 98, 95, 105, 100, 34, 58, 50, 44, 34, 110, 111, 110, 99, 101, 34, 58, 49, 49, 57, 54, 48, 55, 55, 49, 56, 53, 48, 48, 54, 56, 55, 55, 52, 57, 50, 53, 44, 34, 112, 111, 119, 34, 58, 91, 50, 48, 54, 52, 48, 57, 56, 44, 49, 57, 55, 56, 48, 53, 48, 57, 44, 50, 54, 49, 57, 48, 51, 50, 55, 44, 50, 55, 50, 56, 55, 51, 52, 57, 44, 54, 50, 52, 48, 56, 56, 48, 51, 44, 55, 49, 57, 52, 53, 48, 55, 53, 44, 55, 55, 56, 56, 49, 51, 49, 53, 44, 56, 54, 48, 55, 52, 48, 49, 55, 44, 57, 48, 56, 48, 57, 48, 51, 55, 44, 57, 57, 55, 52, 56, 52, 50, 53, 44, 49, 48, 53, 52, 49, 52, 48, 48, 48, 44, 49, 49, 52, 57, 52, 56, 51, 56, 53, 44, 49, 50, 54, 51, 51, 56, 48, 57, 48, 44, 49, 50, 57, 53, 54, 57, 57, 51, 48, 44, 49, 51, 51, 52, 57, 52, 51, 57, 52, 44, 49, 51, 53, 51, 54, 56, 56, 53, 52, 44, 49, 52, 50, 53, 49, 54, 51, 49, 52, 44, 49, 53, 48, 54, 56, 56, 49, 51, 56, 44, 49, 53, 49, 51, 56, 57, 51, 48, 51, 44, 49, 54, 48, 50, 51, 52, 52, 48, 49, 44, 50, 49, 57, 56, 57, 57, 54, 49, 53, 44, 50, 51, 49, 51, 48, 56, 54, 55, 49, 44, 50, 51, 54, 49, 52, 57, 54, 55, 52, 44, 50, 51, 55, 53, 49, 48, 50, 52, 53, 44, 50, 52, 53, 50, 51, 48, 49, 51, 52, 44, 50, 56, 52, 49, 55, 50, 52, 53, 49, 44, 50, 57, 49, 48, 50, 55, 51, 49, 54, 44, 51, 48, 52, 51, 53, 51, 55, 53, 52, 44, 51, 49, 52, 51, 55, 57, 50, 57, 51, 44, 51, 53, 54, 51, 57, 55, 56, 50, 48, 44, 51, 53, 57, 54, 54, 51, 57, 50, 54, 44, 51, 55, 50, 50, 50, 48, 50, 50, 50, 44, 51, 56, 56, 54, 56, 53, 54, 48, 56, 44, 51, 57, 56, 51, 49, 54, 55, 53, 57, 44, 52, 50, 51, 52, 55, 54, 54, 54, 48, 44, 52, 50, 53, 48, 53, 54, 55, 56, 53, 44, 52, 50, 53, 55, 54, 50, 56, 52, 57, 44, 52, 52, 55, 54, 56, 50, 51, 52, 50, 44, 52, 54, 49, 51, 48, 48, 55, 53, 48, 44, 52, 55, 52, 56, 53, 55, 54, 56, 48, 44, 52, 56, 53, 52, 56, 51, 48, 55, 56, 44, 52, 57, 55, 50, 55, 56, 48, 50, 54, 93, 125, 125, 10, 123, 34, 105, 100, 34, 58, 34, 51, 34, 44, 34, 106, 115, 111, 110, 114, 112, 99, 34, 58, 34, 50, 46, 48, 34, 44, 34, 109, 101, 116, 104, 111, 100, 34, 58, 34, 115, 117, 98, 109, 105, 116, 34, 44, 34, 112, 97, 114, 97, 109, 115, 34, 58, 123, 34, 101, 100, 103, 101, 95, 98, 105, 116, 115, 34, 58, 50, 57, 44, 34, 104, 101, 105, 103, 104, 116, 34, 58, 57, 54, 56, 52, 44, 34, 106, 111, 98, 95, 105, 100, 34, 58, 50, 44, 34, 110, 111, 110, 99, 101, 34, 58, 49, 55, 53, 51, 55, 54, 50, 49, 56, 54, 55, 50, 53, 53, 50, 50, 48, 55, 50, 48, 44, 34, 112, 111, 119, 34, 58, 91, 49, 53, 48, 53, 54, 56, 44, 50, 50, 55, 48, 55, 49, 51, 44, 49, 48, 56, 49, 52, 48, 48, 55, 44, 49, 50, 51, 55, 50, 57, 56, 54, 44, 53, 50, 50, 52, 52, 51, 49, 53, 44, 53, 51, 57, 52, 50, 55, 48, 51, 44, 54, 51, 54, 53, 57, 48, 55, 55, 44, 54, 57, 53, 56, 55, 50, 50, 54, 44, 56, 51, 52, 51, 56, 48, 54, 50, 44, 56, 54, 53, 55, 53, 50, 54, 52, 44, 57, 50, 54, 50, 55, 50, 57, 57, 44, 49, 49, 51, 56, 56, 53, 56, 52, 52, 44, 49, 50, 48, 48, 51, 57, 55, 53, 50, 44, 49, 50, 50, 49, 50, 48, 55, 54, 49, 44, 49, 50, 52, 56, 54, 54, 50, 56, 50, 44, 49, 51, 52, 50, 48, 48, 49, 57, 48, 44, 49, 57, 55, 52, 48, 54, 50, 55, 55, 44, 50, 48, 50, 48, 53, 56, 55, 48, 52, 44, 50, 49, 57, 49, 52, 50, 51, 55, 51, 44, 50, 50, 55, 57, 51, 54, 53, 52, 51, 44, 50, 52, 48, 53, 48, 48, 56, 52, 53, 44, 50, 53, 48, 52, 56, 56, 57, 49, 53, 44, 50, 56, 57, 48, 52, 50, 54, 55, 50, 44, 51, 49, 53, 57, 56, 56, 57, 56, 48, 44, 51, 50, 48, 57, 51, 54, 48, 53, 48, 44, 51, 50, 48, 57, 52, 52, 50, 50, 52, 44, 51, 52, 49, 49, 51, 50, 53, 48, 48, 44, 51, 52, 56, 54, 56, 48, 56, 48, 51, 44, 51, 53, 49, 56, 54, 53, 51, 52, 53, 44, 51, 53, 55, 49, 53, 54, 49, 51, 49, 44, 51, 57, 56, 48, 51, 51, 50, 54, 55, 44, 52, 48, 48, 57, 51, 49, 53, 57, 54, 44, 52, 49, 53, 49, 48, 55, 54, 56, 50, 44, 52, 52, 49, 50, 55, 51, 55, 55, 51, 44, 52, 52, 50, 55, 52, 51, 51, 55, 50, 44, 52, 53, 54, 53, 48, 51, 55, 49, 49, 44, 52, 54, 51, 48, 54, 55, 56, 51, 50, 44, 52, 57, 54, 48, 53, 53, 54, 52, 54, 44, 53, 49, 48, 54, 49, 50, 55, 53, 55, 44, 53, 49, 52, 57, 50, 54, 54, 54, 53, 44, 53, 51, 49, 57, 50, 57, 48, 49, 52, 44, 53, 51, 51, 57, 49, 54, 56, 53, 49, 93, 125, 125, 10, 123, 34, 105, 100, 34, 58, 34, 51, 34, 44, 34, 106, 115, 111, 110, 114, 112, 99, 34, 58, 34, 50, 46, 48, 34, 44, 34, 109, 101, 116, 104, 111, 100, 34, 58, 34, 115, 117, 98, 109, 105, 116, 34, 44, 34, 112, 97, 114, 97, 109, 115, 34, 58, 123, 34, 101, 100, 103, 101, 95, 98, 105, 116, 115, 34, 58, 50, 57, 44, 34, 104, 101, 105, 103, 104, 116, 34, 58, 57, 54, 56, 52, 44, 34, 106, 111, 98, 95, 105, 100, 34, 58, 50, 44, 34, 110, 111, 110, 99, 101, 34, 58, 49, 53, 49, 49, 56, 57, 55, 52, 56, 50, 48, 52, 49, 50, 49, 51, 50, 56, 48, 48, 44, 34, 112, 111, 119, 34, 58, 91, 50, 52, 48, 54, 56, 50, 48, 51, 44, 50, 52, 54, 56, 56, 52, 49, 50, 44, 50, 54, 54, 53, 51, 55, 48, 49, 44, 50, 55, 54, 49, 50, 49, 56, 53, 44, 50, 56, 53, 49, 57, 50, 57, 57, 44, 51, 51, 48, 50, 53, 51, 57, 56, 44, 52, 51, 56, 57, 55, 52, 57, 52, 44, 53, 48, 56, 56, 49, 48, 49, 48, 44, 54, 56, 52, 51, 53, 53, 57, 55, 44, 55, 55, 56, 48, 54, 55, 52, 57, 44, 56, 48, 55, 55, 51, 51, 49, 52, 44, 56, 56, 48, 56, 48, 51, 48, 53, 44, 57, 53, 56, 49, 57, 52, 48, 49, 44, 49, 48, 56, 55, 48, 57, 56, 52, 50, 44, 49, 53, 53, 54, 48, 53, 51, 48, 56, 44, 49, 57, 53, 52, 50, 55, 49, 57, 56, 44, 50, 48, 49, 51, 51, 51, 54, 52, 57, 44, 50, 48, 54, 50, 50, 48, 52, 55, 56, 44, 50, 48, 54, 52, 57, 54, 56, 54, 52, 44, 50, 49, 56, 50, 54, 53, 48, 51, 52, 44, 50, 50, 52, 52, 56, 56, 48, 54, 56, 44, 50, 54, 54, 56, 48, 49, 56, 54, 48, 44, 50, 56, 48, 50, 53, 48, 55, 56, 55, 44, 50, 56, 54, 50, 56, 54, 53, 52, 56, 44, 50, 57, 50, 53, 55, 53, 53, 52, 53, 44, 50, 57, 55, 57, 48, 57, 50, 54, 51, 44, 51, 48, 55, 54, 52, 52, 57, 55, 55, 44, 51, 49, 48, 57, 57, 52, 50, 49, 48, 44, 51, 50, 54, 52, 48, 48, 50, 55, 51, 44, 51, 52, 48, 55, 50, 53, 51, 55, 52, 44, 51, 52, 51, 56, 55, 54, 48, 49, 49, 44, 51, 52, 53, 48, 48, 52, 48, 57, 57, 44, 51, 54, 49, 50, 56, 55, 48, 49, 56, 44, 52, 50, 54, 56, 55, 56, 55, 57, 53, 44, 52, 52, 57, 52, 49, 49, 52, 48, 54, 44, 52, 54, 50, 52, 53, 55, 50, 50, 51, 44, 52, 55, 51, 56, 51, 55, 50, 54, 54, 44, 52, 56, 52, 48, 48, 54, 53, 56, 56, 44, 52, 57, 50, 53, 51, 56, 51, 55, 54, 44, 53, 50, 56, 52, 54, 52, 53, 51, 57, 44, 53, 51, 51, 57, 56, 50, 54, 51, 54, 44, 53, 51, 52, 57, 52, 53, 55, 50, 48, 93, 125, 125, 10, 123, 34, 105, 100, 34, 58, 34, 49, 34, 44, 34, 106, 115, 111, 110, 114, 112, 99, 34, 58, 34, 50, 46, 48, 34, 44, 34, 109, 101, 116, 104, 111, 100, 34, 58, 34, 108, 111, 103, 105, 110, 34, 44, 34, 112, 97, 114, 97, 109, 115, 34, 58, 123, 34, 97, 103, 101, 110, 116, 34, 58, 34, 104, 115, 112, 109, 105, 110, 101, 114, 34, 44, 34, 108, 111, 103, 105, 110, 34, 58, 34, 50, 53, 50, 57, 55, 51, 51, 49, 64, 113, 113, 46, 99, 111, 109, 47, 56, 56, 56, 34, 44, 34, 112, 97, 115, 115, 34, 58, 34, 120, 34, 125, 125, 10, 123, 34, 105, 100, 34, 58, 34, 49, 34, 44, 34, 106, 115, 111, 110, 114, 112, 99, 34, 58, 34, 50, 46, 48, 34, 44, 34, 109, 101, 116, 104, 111, 100, 34, 58, 34, 108, 111, 103, 105, 110, 34, 44, 34, 112, 97, 114, 97, 109, 115, 34, 58, 123, 34, 97, 103, 101, 110, 116, 34, 58, 34, 104, 115, 112, 109, 105, 110, 101, 114, 34, 44, 34, 108, 111, 103, 105, 110, 34, 58, 34, 109, 49, 51, 49, 54, 51, 56, 53, 54, 57, 55, 56, 64, 49, 54, 51, 46, 99, 111, 109, 47, 102, 97, 48, 54, 34, 44, 34, 112, 97, 115, 115, 34, 58, 34, 120, 34, 125, 125, 10, 123, 34, 105, 100, 34, 58, 34, 49, 34, 44, 34, 106, 115, 111, 110, 114, 112, 99, 34, 58, 34, 50, 46, 48, 34, 44, 34, 109, 101, 116, 104, 111, 100, 34, 58, 34, 108, 111, 103, 105, 110, 34, 44, 34, 112, 97, 114, 97, 109, 115, 34, 58, 123, 34, 97, 103, 101, 110, 116, 34, 58, 34, 104, 115, 112, 109, 105, 110, 101, 114, 34, 44, 34, 108, 111, 103, 105, 110, 34, 58, 34, 49, 49, 52, 55, 51, 48, 53, 48, 52, 64, 113, 113, 46, 99, 111, 109, 47, 48, 48, 51, 34, 44, 34, 112, 97, 115, 115, 34, 58, 34, 120, 34, 125, 125, 10]
20190122 22:27:40.916 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 215851
20190122 22:27:40.921 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 217363
20190122 22:27:40.929 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 217406
20190122 22:27:40.937 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 218081
20190122 22:27:40.940 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 218527
20190122 22:27:40.943 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 218841
20190122 22:27:40.946 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 219060
20190122 22:27:40.949 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 219190
20190122 22:27:40.952 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 219215
20190122 22:27:40.955 WARN grin_servers::mining::stratumserver - (Server ID: 0) Dropping worker: 219535
20190122 22:27:40.956 ERROR grin_util::logger -
thread 'unnamed' panicked at 'called Result::unwrap() on an Err value: Os { code: 107, kind: NotConnected, message: "Transport endpoint is not connected" }': src/libcore/result.rs:1009stack backtrace:
0: 0x55a1efaa606d - backtrace::backtrace::trace::h2309a19e9582c4ed
1: 0x55a1efaa5192 - backtrace::capture::Backtrace::new::h93a1fac54c6e6f9e
2: 0x55a1efa2ef30 - grin_util::logger::send_panic_to_log::{{closure}}::h47e4e241f95c3029
3: 0x55a1efb70d49 - std::panicking::rust_panic_with_hook::h8cbdfe43764887be
at src/libstd/panicking.rs:495
4: 0x55a1efb707f1 - std::panicking::continue_panic_fmt::h3d3c5a833c00a5e1
at src/libstd/panicking.rs:398
5: 0x55a1efb706d5 - rust_begin_unwind
at src/libstd/panicking.rs:325
6: 0x55a1efb8d94c - core::panicking::panic_fmt::h4d67173bc68f6d5a
at src/libcore/panicking.rs:95
7: 0x55a1ef4d7109 - core::result::unwrap_failed::h35c7c4ebbfc8d948
8: 0x55a1ef4daaaf - grin_servers::mining::stratumserver::accept_workers::h351140b5acd7a8ea
9: 0x55a1ef4c1f81 - std::sys_common::backtrace::__rust_begin_short_backtrace::h592638a05c079110
10: 0x55a1ef4fa30d - std::panicking::try::do_call::hcd548bb86728f450
11: 0x55a1efb86c79 - __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:102
12: 0x55a1ef509c8e - <F as alloc::boxed::FnBox>::call_box::h88b1188124b62458
13: 0x55a1efb7a85d - <alloc::boxed::Box<(dyn alloc::boxed::FnBox<A, Output=R> + 'a)> as core::ops::function::FnOnce>::call_once::hece536cf07b94f8d
at /rustc/9fda7c2237db910e41d6a712e9a2139b352e558b/src/liballoc/boxed.rs:683
- std::sys_common::thread::start_thread::h9605a7df0f911844
at src/libstd/sys_common/thread.rs:24
- std::sys::unix::thread::Thread::new::thread_start::hca8e72c41fa9d291
at src/libstd/sys/unix/thread.rs:90
14: 0x7fb3d06fd6b9 - start_thread
15: 0x7fb3d021d41c - clone
16: 0x0 -

[rlinxy]

One more 'panic':

20190123 17:48:37.847 ERROR grin_util::logger -
thread 'stratum_server' panicked at 'called Option::unwrap() on a None value': src/libcore/option.rs:355stack backtrace:
0: 0x563115e3406d - backtrace::backtrace::trace::h2309a19e9582c4ed
1: 0x563115e33192 - backtrace::capture::Backtrace::new::h93a1fac54c6e6f9e
2: 0x563115dbcf30 - grin_util::logger::send_panic_to_log::{{closure}}::h47e4e241f95c3029
3: 0x563115efed49 - std::panicking::rust_panic_with_hook::h8cbdfe43764887be
at src/libstd/panicking.rs:495
4: 0x563115efe7f1 - std::panicking::continue_panic_fmt::h3d3c5a833c00a5e1
at src/libstd/panicking.rs:398
5: 0x563115efe6d5 - rust_begin_unwind
at src/libstd/panicking.rs:325
6: 0x563115f1b94c - core::panicking::panic_fmt::h4d67173bc68f6d5a
at src/libcore/panicking.rs:95
7: 0x563115f1b87b - core::panicking::panic::h6f50c0de2dcd7974
at src/libcore/panicking.rs:59
8: 0x56311586e643 - grin_servers::mining::stratumserver::StratumServer::clean_workers::h7ed013f79475a4b1
9: 0x56311586eddc - grin_servers::mining::stratumserver::StratumServer::run_loop::ha43b1af80fe23777
10: 0x563115851445 - std::sys_common::backtrace::__rust_begin_short_backtrace::ha323e8865aef0cd8
11: 0x563115888215 - std::panicking::try::do_call::h7d55ef3d3c7b3d9e
12: 0x563115f14c79 - __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:102
13: 0x5631158970f7 - <F as alloc::boxed::FnBox>::call_box::h206946f6b63301ce
14: 0x563115f0885d - <alloc::boxed::Box<(dyn alloc::boxed::FnBox<A, Output=R> + 'a)> as core::ops::function::FnOnce>::call_once::hece536cf07b94f8d
at /rustc/9fda7c2237db910e41d6a712e9a2139b352e558b/src/liballoc/boxed.rs:683
- std::sys_common::thread::start_thread::h9605a7df0f911844
at src/libstd/sys_common/thread.rs:24
- std::sys::unix::thread::Thread::new::thread_start::hca8e72c41fa9d291
at src/libstd/sys/unix/thread.rs:90
15: 0x7f10059636b9 - start_thread
16: 0x7f100548341c - clone
17: 0x0 -

[hashmap]

Why do you want to merge it after tokio-stratum?

[ignopeverell]

@hashmap not sure who the question is for? I'm ok merging this now.

[hashmap]

@ignopeverell it was a question to @sesam reg the first line in pr description. I'm ok too, however I feel like we are kicking the can down the road, I'd prefer to understand why we can't find stats for the worker.

[ignopeverell]

There is a lot wrong about the stratum server right now. So we can:

1. Do small incremental improvements.
2. Wide-spread refactor
3. Rewrite it.

I looks like we're doing 3 already, so I don't really see the point in 2. And until 3 is ready, then 1 makes sense. No?